body {
    background:url(../img/login_bg.jpg) no-repeat #f8f6e9;
    background-size: cover;
}
.mycenter{
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
    height: 350px;
    width:400px;
    padding: 2% 3% 3% 3%;
    background-color: #ffffff;
    border-radius: 10px;
    opacity: 0.9;
}
.mycenter mysign{
    width: 380px;
}
.mycenter .mysign h3{
    margin-bottom: 50px;
}
.mycenter input,checkbox,button{
    margin-top:2%;
    margin-left: 10%;
    margin-right: 10%;
}
.mycheckbox{
    margin-top:10px;
    margin-left: 40px;
    margin-bottom: 10px;
    height: 10px;
}